Feeding composition for members of the penaeus genus of the class crustacea

ABSTRACT

A feeding composition for feeding members of the Penaeus genus of the Class Crustacea including (i) prior art feeding compositions and admixed therewith (ii) Crustacea Class-exciting and/or attracting and/or stimulating and/or inciting amounts and concentrations of excitants, attractants, stimulants and/or incitants which include molecules including but not limited to the compound having the structure: ##STR1##

This is a Divisional of application Ser. No. 08/413,440 filed on Mar. 30, 1995, now U.S. Pat. No. 5,579,723 which in turn, is a Continuation-in-Part of application Ser. No. 08/279,181 filed on Jul. 22, 1994, now U.S. Pat. No. 5,474,030.

BACKGROUND OF THE INVENTION

Our invention is drawn to a process for determining excitants, stimulants, attractants and incitants for members of the Penaeus genus of the Class Crustacea, apparatus for carrying out such a process and a method for exciting, inciting, stimulating and/or attracting members of the Penaeus genus of the Class Crustacea by means of placing within a body of saline water near a surface or throughout the volume to which such Crustacea are desired to be attracted, stimulated, incited and/or excited, a Crustacea attracting, stimulating, inciting and/or exciting concentration and quantity of at least one of the substances:

(i) N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR2## (ii) S-methyl methionine sulfonium halides defined according to the structure: ##STR3## (wherein X is chloro or bromo); (iii) methionine having the structure: ##STR4## (iv) trimethyl amine oxide hydrate having the structure: ##STR5## (v) 1-octen-3-ol having the structure: ##STR6## (a mixture of isomers having the structures: ##STR7## (vi) methional having the structure: ##STR8## (vii) dimethyl sulfoxide having the structure: ##STR9## (viii) 50:50 mole:mole mixture of skatole/indole, skatole having the structure: ##STR10## indole having the structure: ##STR11## (ix) propionthetin halides having the structure: ##STR12## wherein X is chloro or bromo; (x) ammonium chloride;

(xi) ammonium acetate;

(xii) acetic acid having the structure: ##STR13## (xiii) glucose; (xiv) "raw sugar" (sucrose and "impurities");

(xv) Thaumatin (known as TALIN® a trademark of the Tate and Lyle Company Limited of the United Kingdom), a mixture Thaumatin B, Thaumatin I and Thaumatin II, the liquid/the liquid chromatograms of which are indicated in FIGS. 23 and 24 attached hereto and described, infra. Thaumatin I is shown also by the symbol:

     Lys.sup.46,Asp.sup.113,Asp.sup.137 !

as further specifically described in U.S. Pat. No. 5,221,624 issued on Jun. 22, 1993 the specification of which is incorporated herein by reference;

(xvi) 2-methyl-3-(methyldithio)furan having the structure: ##STR14## (xvii) aqueous ammonia; and (xviii) yeast extract (also hereinafter referred to as "ASIE" substance(s)) as well as feeding compositions containing (i) one or more of such "ASIE" substances admixed with (ii) prior art feeding compositions.

Aquatic animals utilize water-borne "chemical signals" (chemical stimuli) to identify and orient toward potential food sources, to escape predators and locate mates. These specific chemical signals are recognized in spite of the chemical complexity of aquatic environments. Therefore, the chemical environment of aquatic animals is vitally important, both physiologically and behaviorally, to understand the status and role of animals in the aquatic environment. The function of specific chemical signals becomes even more significant in a managed biological system (i.e., aquaculture ponds or tanks) that is optimized for production of a single aquatic species (e.g., members of the Penaeus genus of the Class Crustacea) since these chemical signals regulate feeding behavior and possibly control reproduction. Because feeds are a significant expense in most aquaculture operations, the need to maximize feeding rates and reduce wasted feed, thereby lowering production costs and the possible lowering of bacterial/viral infections is paramount to economic success.

The importance of chemoattractants and/or feeding stimulants in improving both initial palatability and overall feeding rates as a means to reduce wasted feed is now fully recognized. The feed quality and environmental conditions (i.e., water quality and current patterns) have direct effects on the effectiveness of feed attractants and feed stimulants. For these reasons, food detection and feeding stimulation ultimately determine the commercial value of an aquatic feed.

A number of attempts at obtention of efficacious feeding stimulants for various aquatic species and for creation of appropriate testing apparatus having a high degree of efficiency for determining good stimulants and attractants for aquatic species are set forth in the literature. Thus, U.S. Pat. No. 4,250,835 issued Feb. 17, 1981 and U.S. Pat. No. 4,249,480 issued Feb. 10, 1981 disclose apparatus and methods for rearing shrimp through the larvae stage wherein the shrimp are subjected to controlled conditions and a common enclosure for the male and female adult shrimp is provided which permits uncontrolled access of the shrimp to one another and wherein the shrimp are maintained through a plurality of cycles of mating, spawning and hatching. The system disclosed provides filtration means for filtering the medium of the common enclosure and with collecting means for harvesting hatched shrimp at preselected times from the common enclosure medium as the medium moves into the filtration means. U.S. Pat. No. 4,828,829 of May 9, 1989 discloses a visual fish attractant that aids in the dispersion of traditional scent and taste attractants. The fish attractant compositions include one or more oils, such as mineral oil, cod liver oil, menhaden oil, herring oil, anise oil, salmon oil, as well as pigments, fragrances, fish scent, dispersed pigments, and light-reflective particles that act both as a visual attractant and as an aid to controlled dispersion of the oil and scent compositions.

Lombardo, et al, Comp.Biochem.Physiol., Vol. 101C, No. 2, pages 389-398, 1992, "Amino Acids and Derivatives as Food-Finding Signals in the Freshwater Snail Planorbarius corneus (L.)" discloses the behavioral responses of the freshwater snail to various amino acids including 1-aspartic acid, d-alanine, histamine, proline and aspartame.

It should be pointed out, however, that the compounds having the structures: ##STR15## wherein X is a "univalent anion" such as chloride ion or bromide ion are used to attract in a gel vertebrate fish such as red snapper and carp in Japanese Published Application J91/27231 (Nakajima) abstracted at Chem. Abstracts, Volume 115:113303n. The disclosure of Japanese Published Application 91/27231 does not detract from the patentability of the instant invention.

Nothing in the prior art, however, discloses the efficient process for attracting, inciting, stimulating and/or exciting members of the Penaeus genus of the Class Crustacea from or in a volume of water inhabited by said member(s) of the Penaeus genus of the Class Crustacea in or to a desired location or volume within a body of water by applying at least one of the specific materials found to be useful in our invention, to wit the "ASIE" substances found to be so useful in our invention. Furthermore, nothing in the prior art discloses feeding compositions containing such "ASIE" substances admixed with prior art feeding materials for such members of the Penaeus genus of the Class Crustacea.

THE INVENTION

Accordingly, our invention provides a process for attracting, exciting, stimulating and/or inciting at least one member of the Penaeus genus of the Class Crustacea from a volume of water or a surface inhabited by said member of the Penaeus genus of the Class Crustacea to a desired location or volume within a body of water comprising the step of applying an aqueous saline solution containing a Crustacea-attracting, exciting, stimulating and/or inciting concentration of at least one substance (referred to as "ASIE" substance(s)) selected from the group consisting of:

(i) N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR16## (ii) at least one S-methyl methionine sulfonium halide having the structure: ##STR17## (wherein X is a chloride anion or a bromide anion); (iii) methionine having the structure: ##STR18## (iv) trimethyl amine oxide hydrate having the structure: ##STR19## (v) (R)(S)l-octen-3-ol having the structure: ##STR20## (a mixture of isomers having the structures: ##STR21## (vi) methional having the structure: ##STR22## (vii) dimethyl sulfoxide having the structure: ##STR23## (viii) 50:50 mole:mole mixture of skatole/indole, skatole having the structure: ##STR24## and indole having the structure: ##STR25## (ix) propionthetin halides having the structure: ##STR26## wherein X is a chloride anion or a bromide anion; (x) ammonium chloride;

(xi) ammonium acetate;

(xii) acetic acid having the structure: ##STR27## (xiii) glucose; (xiv) raw sugar (sucrose and "impurities") for example, Osceola Brown Sugar marketed by Osceola Farms Inc. of Pahokee, Fla. (the headspace analysis for which is set forth in FIG. 27 described in detail, infra);

(xv) Thaumatin (known as TALIN® a trademark of the Tate and Lyle Company Limited of the United Kingdom), a mixture Thaumatin B, Thaumatin I and Thaumatin II, the liquid/the liquid chromatograms of which are indicated in FIGS. 23 and 24 attached hereto and described, infra. Thaumatin I is shown also by the symbol:

     Lys.sup.46,Asp.sup.113,Asp.sup.137 !

as further specifically described in U.S. Pat. No. 5,221,624 issued on Jun. 22, 1993 the specification of which is incorporated herein by reference;

(xvi) 2-methyl-3-(methyldithio)furan having the structure: ##STR28## (xvii) aqueous ammonia; and (xviii) yeast extract

taken alone, or in combination with naturally occurring excitants, stimulants, attractants and/or incitants for the Penaeus genus of the Class Crustacea such as natural Crustacean/cephalopod extracts to the vicinity of said desired location or volume. Our invention also describes a process for exciting, attracting, stimulating and/or inciting a member of the Penaeus genus of the Class Crustacea within a volume of water inhabited by such member of the Penaeus genus of the Class Crustacea comprising the step of applying an aqueous solution containing a Crustacean-exciting, attracting, inciting and/or stimulating concentration of one of the above materials (designated as "ASIE" materials) to the vicinity of said volume inhabited by said member of the Penaeus genus of the Class Crustacea. Examples of such members of the Penaeus genus of the Class Crustacea are Penaeus setiferus, Penaeus vannamei and Penaeus aztecus.

The ultimate goal of the ascertainment of such attractancy, stimulation, incitance and/or excitement is to intensify the feeding kinetics (e.g., rate and quantity of food intake and metabolism) for the members of said Penaeus genus. Accordingly, this invention also pertains to a feeding protocol for such Penaeus genus relating to the aforesaid ascertainment and feeding compositions pertaining to said feeding protocol.

Thus, our invention is also directed to feeding compositions for feeding members of the Penaeus genus of the Class Crustacea including (i) prior art feeding compositions (such as RANGEN®-35, a mixture of 35% protein, 7% fat, fish meal, fish oil and minor amounts of mineral and vitamin nutrients) and also containing, for example, L-ascorbic acid-2-phosphate or its salts as described in Published Japanese Applications J94/093,821 and J94/093,822 assigned to Showa Denko KK and abstracted in the Derwent Patents Index Alerting Abstracts Bulletin for week 9445 issued on Jan. 4, 1995 as follows: SHOW D13 87-253800/36=JP94093821-B2 Food additive for fish farming--contains L-ascorbic acid-2-phosphate or its salts as active ingredient

SHOWA DENKO KK 86.01.30 86JP-016739

C01 (94.11.24) #JP62175142.A A23K 1/18, 1/16, A61K 31/375//COZD 307/72

Based on JP62175142A

A food additive contg. L-ascorbic acid-2-phosphate or its salts as active ingredient is claimed.

USE/ADVANTAGE--Used as a stable food additive with an ascorbic acid effect for fish farming.

In an example, a pellet fodder (basic fodder) composed of 55% white bait powder, 32% alpha-potato starch, 5% soy bean oil, McCollum and 5% ascorbic acid contg. vitamins was prepd. This was used in an ascorbic acid shortage fodder zone. To the basic fodder compan. (1 kg), 2 m.mmol of ascorbic acid was added for use in an ascorbic acid added fodder zone. To the basic fodder compan. (1 kg ), 2 mmol of L-ascorbic acid-2-phosphate Mg was also added. The vitamins mixt. (5 g) contained 6 mg of thiamine, HCl, 20 mg of riboflavin, 4 mg of pyridoxic HCl. 0.009 mg of vitamin B12. 80 mg of nicotinic acid, 800 mg of Chlorin chloride, 400 mg of inositol, 28 mg of ca-pantothenate, 6 mg of biotin, 1.5 mg of acid 1.5 mg, 40 mg alpha-tocopherol, 4 mg menadione, 0.05 mg of calciferol, 20 mg of letinene acetate and 3596 mg of cellulose. Satd. pellet fodders were suspended to the fry of rainbow trout which were fed for 100 days. In each zone, 200 of fries were fed. The fish were supplied 6 times per day from the first until the 80th day and 4 times per day from the 81st until the 100th day. The difference of average body wt. between zones was little, but transformed fries and mortality were decreased in the L-ascorbic acid adding zone. No appearance of transformed fries were observed in the L-ascorbic acid -2-phosphate Mg added zone. (5 pp)

SHOW D13 88-025158/04=JP94093822-B2

Ingredient for feed of crustacea--comprises ester of L-ascorbic acid-2-phosphoric acid or its salt

SHOWA DENKO KK 86.06.05 86JP-129283

C03 (94.11.24) *JPd2285759.A A23Pf 1/18, 1/16, A61K 31/375 Based on JP62285759A

The ingredient comprises an appropriate amt. of the ester of L-ascorbic acid-2-phosphoric acid or its salt, in the feed.

USE/ADVANTAGE--A nutritious and economical ingredient used as an efficient growth promoter for e.g. shrimps or lobsters. (6 pp)

and/or fish growth hormone polypeptides produced by culturing microorganisms carrying recombinant DNA plasmids as described in Published Japanese Application J94/095,938 assigned to Kyowa Hakko Kogyo KK and abstracted as set forth below:

KYOW D16 88-008665/02=JP94095938-Be Fish growth hormone poly-peptide--produced by culturing microorganisms carrying recombinant DNA plasmid KYOWA HAKKO KOGYO KK 85.03.13 92JP-204982 (Div ex 85.03.13 85JP-050096) C03 (94.11.30) *EP 166444-A C12N 15/18, C07K 13/00, CI2N 1/21 //A23K 1/165, A61K 35/74, 37/36, C12P 21/02 (C12N 1/21, C12N 1:19) (C12P 21/02, C12R 1:19)

Based on JP5207883-A

Addnl. Data: SEKINE S (SEKI/)

Fish growth hormone polypeptide (I) having a disclosed peptide sequence is new. Also claimed are DNA and recombinant DNA which code for (I) and microorganisms contg. the recombinant DNA which codes for (I).

An m-RNA of fish growth hormone is isolated from the pituitary gland of fish belonging to Cupleiformes e.g. salmon, and used as a template to prepare cDNA. A recombinant plasmid (e.g. pSGHI and pSGH14) incorporating the cDNA is prepd. The recombinant plasmid is incorporated in a host microorganism. The DNA and recombinant plasmid can be used for expression of fish growill hormone gone in bacteria such as E. coli. Fish. growth hormones are Produced by culturing microorganisms carrying the recombinant Plasmid.

USE--(I) has a stimulating effect on the growth of fish and is used as component of bait for fish cultivation. (11 pp) as published in the Derwent Chemical Patents Index Alerting Abstracts Bulletin for week 9501 issued on Feb. 3, 1995 and being admixed therewith (ii) Crustacea-Class (Penaeus genus) exciting and/or attracting and/or inciting and/or stimulating amounts and concentrations of at least one of the substances set forth as "ASIE" substances, supra.

Our invention is also directed to apparatus for determining whether a given substance at a given aqueous concentration or variable concentrations attracts, excites, incites and/or stimulates at least one member of the Penaeus genus of the Class Crustacea comprising static holding tank means, flow-through holding tank means and/or Y-maze apparatus means.

More specifically, our invention is further directed to apparatus for determining whether a given substance at a given aqueous concentration or variable concentrations excites a member of the Penaeus genus of the Class Crustacea comprising:

(a) static holding tank means containing (i) a volume of water and (ii) at least one live member of the Penaeus genus of the Class Crustacea within said volume of saline water;

(b) pump-injected test solution feeding means for pumping aqueous solutions at variable or constant flow rates of test substance into the static holding tank means;

(c) visible light generating and guidance means for guiding visible wavelength light of variable or preferably constant intensity into said volume of water in said static holding tank means;

(d) first variable power source means for engaging the visible light generating means;

(e) second variable power source means for engaging the pump generated feeding means; and

(f) variable focus/focal length video camera or camcorder recording means for recording the movements of one or more specified body appendages and/or the lateral direction and velocity of one or more specified body appendages of one or more of the members of the Penaeus genus of the Class Crustacea when the pump injected feeding means and visible light generating means are engaged;

whereby it can be determined whether a particular dilution of a test substance will cause a member of the Penaeus genus of the Class Crustacea to be "excited".

The "recording" by the variable focus/focal length video camera or camcorder recording means is preferably for recording on film or magnetic tape.

An additional aspect of the apparatus of our invention is covered herein for determining whether a given substance at a given aqueous concentration or variable concentrations will attract, excite or incite members of the Penaeus genus of the Class Crustacea. Such apparatus comprises:

(a) flow-through holding tank means where varying concentrations of test solutions are fed in at the inlet of the holding tank means and flow through the holding tank to an exit portal while a member of the Penaeus genus of the Class Crustacea is positioned within the "flow-through" holding tank. The holding tank contains (i) flowing saline water and (ii) at least one live member of the Penaeus genus of the Class Crustacea within the flowing saline water;

(b) pump-injected test solution feeding means for pumping aqueous solutions at variable or preferably constant flow rates of test solution into an orifice in front of the entry portal into the flow-through holding tank;

(c) visible light generating and guidance means for guiding visible wavelength light of variable or preferably constant intensity into the volume of water flowing in the flow-through holding tank;

(d) a first variable power source for energizing or "engaging" the visible light generating means;

(e) a valuable power source for energizing or "engaging" the pump injection feeding means (the pump has variable heads so that the flow rate of the added chemical solution (containing at least one "ASIE") may be added to the basic flow of saline water through the flow-through holding tank);

(f) variable focal length video camera or camcorder recording means for recording the movements and/or the lateral direction and velocity of one or more members of the Penaeus genus of the Class Crustacea when the pump injection feeding means is engaged and when the visible light generating means is engaged; and

(g) specially designed camera platform and blind means (a part of our invention) the purpose of which is to shield the observer from the test animal in order to prevent the test animal from being extraneously stressed and/or distracted. (The variable focal length video camera or camcorder recording means is mounted within the specially designed camera platform and blind means.)

The variable focal length video camera or camcorder recording means is of necessity on a line of visibility between the camera lens and the limits of motion of the member of the Penaeus genus of the Class Crustacea. Accordingly, the apparatus of our invention must contain one or two clear panels behind which is located the video camera or camcorder and in front of which is located at every point of view of the lens of the video camera or camcorder all of the members of the Penaeus genus of the Class Crustacea within the flow-through holding tank or within the static holding tank or within the Y-maze apparatus as the case may be.

More specifically, the variable focus multi-directional video camera or camcorder/video camera or camcorder platform apparatus for facilitating visible wavelength radiation communication between the moving member of the Penaeus genus of the Class Crustacea and an image display of the moving object on, for example, visible radiation sensitive film or visible radiation sensitive magnetic tape comprising:

(1) a horizontal static substantially rectangular planar base located in an "X-Y" plane, having an upper surface and having two substantially parallel ends parallel to the "X" axis and two substantially parallel ends parallel to the "Y" axis; with one end parallel to the "Y" axis being along a line designated "E₁ ";

(2) a vertically disposed substantially rectangular planar frame located in a "Y-Z" plane, substantially perpendicular to said horizontal static planar base and having two parallel ends parallel to the "Y" axis and two parallel ends parallel to the "Z" axis, one of said ends parallel to the "Y" axis being contiguous with said static planar base along a first end, said line E₁ of said static planar base, parallel to the "Y" axis, said frame having a first orifice therethrough permitting visible wavelength radiation to be transmitted therethrough;

(3) a continuous right angle-shaped horizontal/vertical planar base/frame movable platform movable in both the "X" and "Y" (or lateral) directions consisting of (i) a substantially rectangular horizontal lamina located in the "X-Y" plane facing and within the planar framework of said horizontal static planar base (1) plane and having an upper surface and a lower surface continuously and sealably juxtaposed in a direction parallel to line E₁ along a line designated E₂ said line E₂ being proximate said line E₁ with (ii) a substantially rectangular vertical lamina located in the "Y-Z" plane facing and within the planar framework of said vertically disposed frame (2) and containing a vertically disposed visible wavelength radiation shield (blind) having a second orifice therethrough located opposite to and being planarly parallel to and within the planar framework of said first orifice in said vertically disposed frame, said right angle-shaped movable platform being located on rollers juxtaposed with and immediately adjacent said lower surface of said right angle-shaped movable platform and said upper surface of said horizontal static base;

(4) a substantially rectangular rotating planar base having an upper surface and a lower surface and having two parallel ends parallel to the "Y" axis and two parallel ends parallel to the "X-Z" plane, being rotatable about a vertex line E₃ in a hinge manner having a direction parallel to each of lines E₁ and E₂ and being substantially proximate lines E₁ and E₂ along a first parallel hinge end in the "Y" direction parallel to the "Y" axis, having variable manually-controllable rotation movement means located at an end of said rotating planar base opposite said first parallel hinge end, and opposite the location of said line E₃, the direction of rotation of said rotating base being from the location of the "X-Y" plane of said right angle-shaped movable platform towards the location of the "Y-Z" plane of said right angle-shaped movable platform about the said vertex line E₃ ; and

(5) a video camera or camcorder fixedly mounted on the upper surface of said rotating planar base, comprising a housing and a lens located in said housing, the focal plane of said lens being substantially parallel to and at a controllably variable distance from the plane of said first orifice of said vertically disposed frame and said second orifice of said visible wavelength radiation shield with said lens, said first orifice and said second orifice all having a common line of vision,

whereby simultaneous manipulation of said rotating planar base and said right angle-shaped movable platform, when the video camera or camcorder is in operation, facilitate visible wavelength radiation communication between (i) an image display resulting from operation of said video camera or camcorder onto, for example, visible light sensitive film or visible light sensitive magnetic tape and (ii) the image of the moving object (that is the member of the Penaeus genus of the Class Crustacea) being transmitted to said video camera or camcorder.

Another aspect of our invention concerns an additional apparatus for determining whether a given substance at a given aqueous concentration or variable concentrations attracts, or stimulates to feed, or incites to feed, or excites, or stimulates a member of the Penaeus genus of the Class Crustacea; and it comprises a "Y-maze" apparatus similar to that disclosed in a paper by Lee, J. Exp. Mar. Biol. Ecol., Volume 153 (1992), pages 53-67,"Chemotaxis by Octopus maya Voss et Solis in a Y-maze". Although similar to the Y-maze of the instant invention, the apparatus disclosed by Lee in the immediately aforementioned reference is different in kind rather than degree from the apparatus of the instant invention.

More specifically, an aspect of the apparatus of the instant invention comprises, inter alia, a recirculating tank means containing a Y-maze which is a rectangular parallelepiped as its "three-dimensional base" having two rectangular parallelepiped-shaped arms; the three-dimensional base having one closed end and one open end and two sides, each sealably connected to an end panel and each terminating at the open end, said open end connected to two diverging parallelepiped-shaped sections as set forth, supra (having a vertex of 5°-45° (preferably having a 10° vertex)); (i) a test substance input section and (ii) a control section, each of which is sealably connected at the open end to one another and to a side of the first three-dimensional base rectangular parallelepiped section. This apparatus has one or both top and bottom panels as transparent panels whereby a variable focal length video camera or camcorder recording means is maintained on one side of the transparent panel with a line of vision from the lens of the video camera or camcorder to every place where all of the members of the Penaeus genus of the Class Crustacea may travel. It should be noted that the control section and test substance input section can be reversed or interchanged (as by changing the location of the test substance input tube as more particularly shown in FIG. 5G and the detailed description of FIG. 5G in the "Detailed Description of the Drawings" section, infra).

In the Y-maze apparatus of our invention, a constant concentration of the test chemical entering one arm of the Y-maze is the preferred method of addition. In the flow-through apparatus, however, there is a constant increase of concentration of the test chemical during the run.

Furthermore, the Y-maze apparatus of our invention also contains a volume of water and at least one live member of the Penaeus genus of the Class Crustacea within the volume of water. The Y-maze apparatus of our invention contains a pump-injected test solution of test chemical for pumping aqueous solutions of test chemical at various flow rates or preferably constant flow rates into the feeding sections of the Y-maze (at one of the diverging parallelepiped-shaped "arms" connected to the base parallelepiped).

Like the flow-through apparatus and the static tank apparatus, the "Y-maze" apparatus has a visible light generating and guidance means for guiding Visible wavelength light of variable or preferably constant intensity into the volume of water in the holding tank and feeding section where a member of the Penaeus genus of the Class Crustacea is located.

The "Y-maze" aspect of the apparatus of our invention also contains variable focal length video camera or camcorder recording means for recording the movements of one or more appendages and/or the lateral direction and velocity of one or more of the members of the Penaeus genus of the Class Crustacea when the pump injection test chemical means and when the visible light generating means are simultaneously energized or "engaged".

More specifically, in determining a value for the response, "R" or "G" of the member of the Penaeus genus of the Class Crustacea whose responses are measured as a result of the practice of our invention, the time taken for the member of the Penaeus genus of the Class Crustacea to act or to respond to the feeding incitant or stimulant or attractant of our invention is a function of the particular material used and its concentration as well as the flow rate of the liquid.

Proposed mathematical models are set forth herein, to wit: ##EQU1## wherein the term:

    θ

is the time taken and the terms "G₁ " and "G₂ " are each values for the responses of the members of the Penaeus genus of the Class Crustacea from the initial time "0" of substance injection until the time that a given definitive Crustacean forward motion commences.

It should be noted that the term "G" is also shown herein as "R".

The rate of change of response with respect to test substance concentration (C) (for example, in terms of moles per liter or grams per liter) is given by the equation: ##EQU2## wherein the symbol:

    dθ/dC

is the rate of change of time with respect to concentration, that is, time of response and the symbol:

    dG.sub.2 /dC

is the rate of change of response with respect to concentration as is the symbol:

    dG.sub.1 /dC

A similar equation is: ##EQU3## which depends on the mathematical model: ##EQU4## Combining the initial mathematical model with the differential equation yields the differential equation: ##EQU5## and the differential equation: ##EQU6##

Changes in response value when concentrations of stimulant change or when concentrations of excitant change or when concentrations of attractant change are shown by the equations: ##EQU7## Thus, for example, in the case of the use of N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR29## the response versus concentration can be shown by the equation:

    --log.sub.10 C=0.8G-2.3

in the static tank, or by one of the equations:

    log.sub.10 C=2.3-0.8G;

    0.8G=2.3-log.sub.10 C;

    G=2.9-1.25log.sub.10 C;

    G.sub.1 =2.9-1.25log.sub.10 C;

    G.sub.2 =2.9-1.25log.sub.10 C;

    G.sub.2 =2.9-2.9log.sub.e C;

Furthermore, the rate of change of response with respect to concentration can be shown by the equations: ##EQU8## and the change in response can be shown by the equation: ##EQU9## Combining the equation

    G.sub.1 =2.9-2.9 log.sub.e C

with the equation:

    dG.sub.1 /dC==2.9/C

and the equation: ##EQU10## will yield the equation: ##EQU11## (showing concentration as a function of time; when a test chemical is added continuously as when using the flow-through or static apparatus; but not the Y-maze apparatus) and the equation: ##EQU12##

When using the flow-through apparatus and using N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR30## as an excitant, attractant, stimulant and/or incitant (on a scale of 0-50, as opposed to a scale of 1-5 when using the static tank-containing apparatus), the mathematical models for the mean response as a function of concentration of the N-acetyl-D-Glucosamine, the test chemical, are as follows: ##EQU13## The mathematical model for the median response as a function of concentration of N-acetyl-D-Glucosamine, the test chemical, is as follows:

    R=-41.98-5.68 log.sub.10 C

Other materials which were tested but which have not been made a part of our invention are as follows:

(i) Taurine, the compound having the structure: ##STR31## (ii) Guanidine, the compound having the structure: ##STR32## (iii) Betaine, the compound having the structure: ##STR33## (iv) citric acid, the compound having the structure: ##STR34## (v) Pyruvic acid, the compound having the structure: ##STR35## (vi) Ferulic acid, the compound having the structure: ##STR36## (vii) Vanillin, the compound having the structure: ##STR37##

(viii) Isovaleraldehyde, the compound having the structure: ##STR38##

(ix) trans-2-hexenal, the compound having the structure: ##STR39## (x) Citral, the mixture of compounds having the structures: ##STR40## (xi) D-Glucosamine, the epimeric mixture of compounds having the structures: ##STR41##

Each of the substances of our invention tested is diluted in a saline solution containing 30 parts per thousand of a "FRITZ®", Super Salt concentration manufactured by the Fritz Chemical Company of Dallas, Tex. 75217. The FRITZ® Super Salt Concentrate contains in major amounts sodium chloride, magnesium sulfate, magnesium chloride and calcium chloride and in minor amounts lithium chloride, sodium molyedate, disodium phosphate, strontium chloride, potassium chloride, sodium bicarbonate, calcium carbonate and magnesium carbonate.

The volume of water described, supra, for containing a member of the Penaeus genus of the Class Crustacea is a dilute saline solution containing the same concentration of 30 parts per thousand of a FRITZ® Super Salt solution containing the above ingredients.

The protocols for using the apparatus of our invention and for determination of the feed compositions of our invention are set forth as follows:

STATIC TANK: TESTING PROTOCOL

I. PREPARATION

1. APPARATUS

A. BETWEEN CHEMICALS

1. Soak test chamber (static tank) in warm water for at least one hour before testing different chemicals.

2. Rinse with hot tap water for approximately 30 seconds.

3. Rinse with de-ionized water for 10 seconds.

4. Dry off outside of chamber and place on test stand.

5. Replace peristaltic pump tubing before testing different chemicals.

6. Calibrate peristaltic pump to deliver at the predetermined flow rate.

7. Place tubing inflow and outflow ends into test chemical bottle.

8. Turn on peristaltic pump to fill tube with water and purge out all the air.

9. Adjust lighting for even illumination in the tank.

10. Set up camera in an appropriate area for viewing the entire bottom of tank.

11. Pour 1,000 mLs of sea water taken from the shrimp holding system into the test tank.

B. BETWEEN TRIALS USING THE SAME CHEMICALS

1. Rinse test tank with warm tap water for approximately 30 seconds.

2. Rinse with de-ionized water for 10 seconds.

3. Dry off outside of chamber and place on tank stand.

4. Between the trials using the same chemical or concentration of the same chemical, pump peristaltic pump tubing with at least 250 mLs salt water.

5. Calibrate peristaltic pump to deliver at the predetermined flow rate.

6. Place tubing inflow and outflow ends into test chemical bottle.

7. Turn on peristaltic pump to fill tube with water and purge out all the air.

8. Adjust lighting for even illumination in the tank.

9. Set up camera in an appropriate area for viewing the entire bottom of the tank.

10. Pour 1,000 mLs of sea water taken from the shrimp holding system into the test tank.

2. TEST ORGANISM

Animals should be chosen from a previously isolated set of animals so repetition does not occur within the test set for a particular chemical concentration. All test animals should be free of chitinolytic bacteria if possible. Most importantly, animals should have all head and mouth appendages (antennules, antennae, maxillae, maxillipeds and walking legs).

1. Select an animal that appears to be calm (i.e., not repetitively hitting head into wall).

2. Net the animal carefully.

3. Place the animal into the test tank.

4. Quickly set the cover over the test tank so the animal does not jump out.

5. If an animal jumps out of the tank or net at any time during transfer, pick it up and place it back into the holding chamber and choose another animal.

II. TEST PROCEDURE

1. PRETRIAL

1. When the animal is placed into the test tank, begin timing the acclimation period of 15 minutes.

2. Record the test date onto the data sheet.

3. When the acclimation period ends, record the acclimation time and turn on the camera to record animal movements.

2. TRIAL

4. Immediately begin timing the run.

5. Observe and record on data sheet the placement and movements of the animal. Also note any problems that occurred during testing.

6. When the 3 minute test is over, turn off the peristaltic pump, camera and timer.

3. POST-TRIAL

7. Remove the chemical delivery tube from the tank and place into the test chemical bottle.

8. Pour the water from the test tank through a net into a waste bucket. The animal should now be in the net.

9. Place the animal into a group or individual holding chamber for later testing.

10. Begin preparation of apparatus and test animal.

FLOW-THROUGH TANK: TESTING PROTOCOL

I. PREPARATION

1. APPARATUS

A. BETWEEN CHEMICALS

1. Soak test chamber (flow-through tank) and divider in an alkaline solution and warm water for at least one hour before testing different chemicals.

2. Rinse with hot tap water for approximately 30 seconds.

3. Rinse with de-ionized water for 10 seconds.

4. Dry off outside of chamber and place on table.

5. Insert the tank divider into the appropriate groove in the center of the tank.

6. Replace peristaltic injection pump tubing before testing different chemicals.

7. Calibrate peristaltic injection pump to deliver at the predetermined flow rate.

8. Place smaller tubing inflow and outflow ends into test chemical bottle.

9. Attach larger recirculation tubing to the ends of the tank via the reducers. The flow of water should go from the tank end with the chemical inlet to opposite end of the tank.

10. Turn on peristaltic injection pump to fill tubes with water and purge out all the air.

11. Adjust lighting for even illumination in the tank.

12. Set up camera blind and camera in an appropriate area for viewing the entire test tank.

13. Pour 500 mLs of sea water taken from the shrimp holding system into the test tank.

B. BETWEEN TRIALS USING THE SAME CHEMICAL

1. Rinse test tank and tank divider with warm tap water for approximately 30 seconds.

2. Rinse with de-ionized water for 10 seconds.

3. Dry off outside of chamber and place on table.

4. Insert the tank divider into the appropriate groove in the center of the tank.

5. Between the trials using the same chemical or concentration of the same chemical, pump peristaltic injection pump tubing with at least 1 liter salt water.

6. Calibrate peristaltic injection pump to deliver at the predetermined flow rate.

7. Place smaller tubing inflow and outflow ends into test chemical bottle.

8. Attach larger recirculation tubing to the ends of the tank via the reducers. The flow of water should go from the tank end with the chemical inlet to opposite end of the tank.

9. Turn on peristaltic injection pump to fill tubes with water and purge out all the air.

10. Adjust lighting for even illumination in the tank.

11. Set up camera blind and camera in an appropriate area for viewing the entire test tank.

12. Pour 500 mLs of sea water taken from the shrimp holding system into the test tank.

2. TEST ORGANISM

Animals should be chosen from a previously isolated set of animals so repetition does not occur within the test set for a particular chemical concentration. All test animals should be free of chitinolytic bacteria if possible. Most importantly, animals should have all head and mouth appendages (antennules, antennae, maxillae, maxillipeds and walking legs).

1. Select an animal that appears to be calm (i.e., not repetitively hitting head into wall).

2. Net the animal carefully.

3. Place the animal into the test tank in the end nearest the tank outflow, facing the inflow (face the animal against the future flow of water).

4. Quickly set the cover over the test tank so the animal does not jump out.

5. If an animal jumps out of the tank or net at any time during transfer, pick it up and place it back into the holding chamber and choose another animal.

II. TEST PROCEDURE

1. PRETRIAL

1. When the animal is placed into the test tank, begin timing the acclimation period. The duration of the acclimation period should be the period of time it takes for the animal to become calm (i.e., not bumping into walls and not attempting to swim or turn in tank). This period should be at least one minute.

2. Record the test date onto the data sheet.

3. Turn on peristaltic injection pump to allow water to circulate in the test chamber.

4. When the acclimation period ends, record the acclimation time and turn on the camera to record animal movements.

2. TRIAL

5. Immediately begin timing the run.

6. Carefully remove the tank divider.

7. Wait 5 seconds. If the animal lunges to the inlet side of the test tank during this time, terminate testing.

8. If the animal stays on the outlet end of the tank, place the chemical outlet tube into the test chemical inlet of the tank.

9. Wait 30 seconds. If the animal lunges to the inlet side of the test tank during this time, terminate testing.

10. Observe and record on data sheet the placement and movements of the animal. Also note any problems that occurred during testing.

11. When the predetermined test time is over, turn off the peristaltic injection pump, camera and timer.

3. POST-TRIAL

12. Remove the chemical delivery tube from the chemical delivery inlet and place into the test chemical bottle.

13. Remove large recirculation tubing and begin cleaning (see Apparatus Preparation above).

14. Pour the water from the test tank through a net into a waste bucket. The animal should now be in the net.

15. Place the animal into a group or individual holding chamber for later testing.

16. Begin preparation of apparatus and test animal.

Y-MAZE: TESTING PROTOCOL

I. PREPARATION

1. APPARATUS

A. BETWEEN CHEMICALS

1. Soak test chamber (Y-maze) and divider in an alkaline solution and warm water for at least one hour before testing different chemicals.

2. Rinse with hot tap water for approximately 30 seconds.

3. Rinse with de-ionized water for 10 seconds.

4. Dry off outside of chamber and place on table.

5. Insert the appropriate tank dividers in the Y-maze.

6. Replace peristaltic injection pump tubing before testing different chemicals.

7. Calibrate peristaltic injection pump to deliver at the predetermined flow rate.

8. Place tubing inflow and outflow ends into test chemical bottle.

9. Turn on peristaltic injection pump to fill tube with liquid and purge out all the air.

10. Adjust lighting for even illumination in the tank.

11. Set up camera in an appropriate area for viewing the entire Y-maze.

12. Fill Y-maze to the proper water level with 5 liters sea water taken from the shrimp holding system.

B. BETWEEN TRIALS USING THE SAME CHEMICAL

1. Rinse Y-maze and divider with warm tap water for approximately 30 seconds.

2. Rinse with de-ionized water for 10 seconds.

3. Dry off outside of chamber and place on table.

4. Insert the appropriate tank dividers in the Y-maze.

5. Between the trials using the same chemical or concentration of the same chemical, pump peristaltic injection pump tubing with at least 250 mLs salt water.

6. Calibrate peristaltic injection pump to deliver at the predetermined flow rate.

7. Place smaller tubing inflow and outflow ends into test chemical bottle.

8. Turn on peristaltic injection pump to fill tube with liquid and purge out all the air.

9. Adjust lighting for even illumination in the Y-maze.

10. Set up camera in an appropriate area for viewing the entire Y-maze.

11. Fill Y-maze to the proper water level with 5 liters of sea water taken from the shrimp holding system.

2. TEST ORGANISM

Animals should be chosen from a previously isolated set of animals so repetition does not occur within the test set for a particular chemical concentration. All test animals should be free of chitinolytic bacteria if possible. Most importantly, animals should have all head and mouth appendages (antennules, antennae, maxillae, maxillipeds and walking legs).

1. Select an animal that appears to be calm (i.e., not repetitively hitting head into wall).

2. Net the animal carefully.

3. Place the animal in the appropriate position in the Y-maze (in the base of the Y-maze).

4. If an animal jumps out of the tank or net at any time during transfer, return it to the holding chamber and choose another animal.

II. TEST PROCEDURE

1. PRETRIAL

1. When the animal is placed into the Y-maze, turn on the recirculation lines of pump; begin timing the acclimation period of 15 minutes.

2. Record the test date onto the data sheet.

3. When the acclimation period ends, turn on the camera to record animal movements.

2. TRIAL

4. Immediately begin timing the run and begin pumping test chemical into the chemical inlet of the Y-maze.

5. After 3 minutes, carefully remove any tank divider.

6. Wait 30 seconds. If the animal lunges into an arm of the Y-maze during this time, terminate testing.

7. Observe and record on data sheet the placement and movements of the animal. Also note any problems that occurred during testing.

8. When the predetermined test time is over, turn off the peristaltic injection pump, camera and timer.

3. POST-TRIAL

9. Return chemical delivery tubes to the test chemical bottles.

10. Remove Y-maze recirculation tubing and begin cleaning (see Apparatus Preparation above).

11. Pour the water from the Y-maze through a net into a waste bucket. The animal should now be in the net.

12. Place the animal into a group or individual holding chamber for later testing.

13. Begin preparation of apparatus and test animal.

FEEDING BEHAVIOR: TESTING PROTOCOL

I. PREPARATION

1. APPARATUS

A. BETWEEN CHEMICALS

1. Soak test chamber (Y-maze) and divider in an alkaline solution and warm water for at least one hour before testing different chemicals.

2. Rinse with hot tap water for approximately 30 seconds.

3. Rinse with de-ionized water for 10 seconds.

4. Dry off outside of chamber and place on table.

5. Insert the appropriate tank dividers into the Y-maze.

6. Replace peristaltic injection pump tubing before testing different chemicals.

7. Calibrate peristaltic injection pump to deliver at the predetermined flow rate.

8. Place tubing inflow and outflow ends into test chemical bottle.

9. Turn on peristaltic injection pump to fill tube with liquid and purge out all the air.

10. Adjust lighting for even illumination in the tank.

11. Set up camera in an appropriate area for viewing the entire Y-maze.

12. Fill Y-maze to the proper water levels with 5 liters of sea water taken from the shrimp holding system.

B. BETWEEN TRIALS USING THE SAME CHEMICAL

1. Rinse Y-maze and divider with warm tap water for approximately 30 seconds.

2. Rinse with de-ionized water for 10 seconds.

3. Dry off outside of chamber and place on table.

4. Insert the appropriate tank dividers into the Y-maze.

5. Between the trials using the same chemical or concentration of the same chemical, pump peristaltic injection pump tubing with at least 250 mLs salt water.

6. Calibrate peristaltic injection pump to deliver at the predetermined flow rate.

7. Place smaller tubing inflow and outflow ends into test chemical bottle.

8. Turn on peristaltic injection pump to fill tube with liquid and purge out all the air.

9. Adjust lighting for even illumination in the Y-maze.

10. Set up camera in an appropriate area for viewing the entire Y-maze.

11. Fill Y-maze to the proper water level with 5 liters of sea water taken from the shrimp holding system.

2. TEST ORGANISM

Animals should be chosen from a previously isolated set of animals so repetition does not occur within the test set for a particular chemical concentration. All test animals should be free of chitinolytic bacteria if possible. Most importantly, animals should have all head and mouth appendages (antennules, antennae, maxillae, maxillipedes and walking legs).

1. Select an animal that appears to be calm (i.e., not repetitively hitting head into wall).

2. Net the animal carefully.

3. Place the animal in the appropriate position in the Y-maze (in the base of the Y-maze).

4. If an animal jumps out of the tank or net at any time during transfer, return it to the holding chamber and choose another animal.

II. TEST PROCEDURE

1. PRETRIAL

1. When the animal is placed into the Y-maze, turn on the recirculation lines of pump and begin timing the acclimation period of 15 minutes.

2. Record the test date onto the data sheet.

3. When the acclimation period ends, turn on the camera to record animal movements.

2. TRIAL

4. Immediately begin timing the run.

5. Insert feeding station with preweighed feed in place.

6. After 3 minutes, carefully remove any tank dividers.

7. Observe and record on a data sheet the placement and movements of the animal. Also note any problems that occurred during the testing.

8. When the predetermined test time is over, turn off the peristaltic injection pump, camera and timer.

3. POST-TRIAL

9. Collect and place food in a drying oven to later record amound ingested by animal or dispersed into the water.

10. Remove Y-maze recirculation tubing and begin cleaning (see Apparatus Preparation above).

11. Pour the water from the Y-maze through a net into a waste bucket. The animal should now be in the net.

12. Place the animal into a group or individual holding chamber for later testing.

13. Begin preparation of apparatus and test animal.

With respect to the Y-maze testing protocol, three tests were carried out using the Y-maze of FIGS. 5A, 5C and 5E described in detail in the Detailed Description of the Drawings, infra.

Mixtures containing "natural extract" and glucose in saline solution were prepared and tested against a control which only had saline solution.

In the following tables, "natural extract" is defined as a 1:1:1 weight ratio of squid mantle:shrimp abdomen:crab claw. Sea water is used containing 30 parts per 1,000 of FRITZ® salt.

    ______________________________________                                         Chemical        Figure                                                         Arm    Inserts  Reference                                                                               Reactions and Position in Tank                        ______________________________________                                         EXAMPLE I                                                                      1 ML NATURAL EXTRACT:1 LITER SEA WATER:GLUCOSE                                 (FINAL CONCENTRATION OF GLUCOSE 10.sup.-3 M)                                   A      NONE     5A       animal (Paneaus vannamei) excited                                              but facing outlet                                     A      NONE     5A       animal jumped into A when gate                                                 lifted                                                A      NONE     5A       animal jumped into A when gate                                                 lifted                                                A      NONE     5A       went into arm A at 0:16                               B      CURVED   5E       facing back wall, slowly turned                                                and moved toward arms: turned to                                               side wall: turned to back wall:                                                turned to side wall: observed                                                  level 5 reactions                                     B      CURVED   5E       animal jumped when gate lifted                        B      CORRAL   5C       jumped to back when gate lifted:                                               at 4:40, animal came out and went                                              toward B: jumped into A                               B      CORRAL   5C       jumped into A when gate lifted                        B      CORRAL   5C       jumped when lifted gate, but                                                   stayed along back of corral:                                                   level 5 reaction                                      B      CORRAL   5C       animal never left position along                                               back of corral: could not see                                                  antennule or maxilliped movements                     ______________________________________                                         EXAMPLE II                                                                     1 ML NATURAL EXTRACT:100 ML SEA WATER:GLUCOSE                                  (AT A GLUCOSE CONCENTRATION OF 10.sup.-2 M)                                    B      CORRAL   5C       animal jumped out of Y-maze                           B      CORRAL   5C       swimming around corral: back                                                   against outlet: into A: stayed in                                              A: extreme max and antennule                                                   movements                                             B      CORRAL   5C       animal "playing dead" in corral:                                               into back A by corral: into                                                    corral: into back of B: to B:                                                  long B-left wall: into corral:                                                 extreme max and antennular                                                     movements                                             B      CORRAL   5C       into back A corner by corral                                                   facing back: across to B side                                                  wall to B back corner facing                                                   side: across to A wall: animal                                                 became stressed and jumped into                                                B: remained in B                                      B      CORRAL   5C       into A: extreme antennule and                                                  maxilliped movements                                  B      CORRAL   5C       playing dead in corral until                                                   5:30: into back A corner: moved                                                to opening of A                                       A      CORRAL   5C       to A back corner facing A wall:                                                into A after a short stop: ran                                                 only approximately 1 minute after                                              entry into A: extreme antennule                                                and maxilliped movements                              A      CORRAL   5C       no movements: stayed in corral                        B      CORRAL   5C       facing back of corral when                                                     started: backed out of corral,                                                 then returned: animal hit head                                                 into wall for a time: level 5                                                  reaction                                              A      CORRAL   5C       facing arms: turned to outlet and                                              at approximately 2:15: level 5                                                 reactions                                             ______________________________________                                         EXAMPLE 3                                                                      CONTROL (SOLELY SEA WATER)                                                     NONE   CORRAL   5C       remained in corral: animal jumped                                              into A at approximately 7:00 when                                              adjusting camera: level 2 rxn                         NONE   CORRAL   5C       never left corral: level 3 or 4                                                reaction                                              NONE   CORRAL   5C       never left corral: level 4 or 5                                                reaction                                              NONE   CORRAL   5C       into A approximately 0:15 and                                                  remained in A                                         NONE   CORRAL   5C       jumped into A then back in corral                                              when gate lifted: slowly came out                                              into back corner of A: over to B                                               wall: slowly walked into B                            NONE   CORRAL   5C       jumped into A at approximately                                                 4:00: jumped back into corral                                                  after 0:30: no outside stimuli                                                 caused these reactions                                NONE   CORRAL   5C       never left corral                                     NONE   CORRAL   5C       active during acclimation:                                                     searched corral until went into A                                              at 9:00: jumped to A back at 9:55                     NONE   CORRAL   5C       went to A wall at approximately                                                4:00: to A back corner: slowly                                                 turned and went into B after                                                   pausing and turning in front of A                     NONE   CORRAL   5C       animal jumped in air then back                                                 into corral when gate lifted:                                                  never left corral                                     ______________________________________                                    

The following application of the feeding behavior:testing protocol was carried out on Paneaus vannamei. Stock solutions were made up at a concentration of 10⁻³ molar. 5 Ml of the stock solution is admixed with 500 grams of feed causing 0.5 grams of feed to contain 1×10⁻⁸ moles of test chemical. The volume in the aquarium where the feed testing is taking place is 150 liters. Accordingly, the average concentration of the test chemical is 7×10⁻¹² molar. When using 7 ml of test solution rather than 5 ml, the final concentration will be 1×10⁻¹¹. The actual feed is RANGEN®35 containing 35% protein, 7% fat, fish meal (without squid) fish oil, and minor amounts of nutrient vitamins and minerals.

The stock solution is diluted to 25 ml with sea water containing 30 ppt of FRITZ® salt described, supra. 25 Ml of the stock solution is sprayed onto the 500 grams of feed. The water content is increased by approximately 5%. The jar containing the solution is sealed and stored for ten days at 0° C. Prior to use, the contents are shaken well.

The feed level is 0.5 grams of pellets per tank per feeding. The following diets J; P; A and C were used on Paneaus vannamei using the feeding behavior testing protocol described, supra.

DIET J

7 Ml of 1×10⁻³ molar 2-methyl-3-(methyldithio)furan having the structure: ##STR42## The solution is diluted to 25 ml with the artificial sea water containing 35 ppt of FRITZ® salt.

DIET P

N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR43## dimethyl sulfoxide having the structure: ##STR44## methional having the structure: ##STR45##

Each of the solutions are 1×10⁻³ molar. The 21 ml is diluted to 25 ml with artificial sea water containing 30 ppt FRITZ® salt.

DIET A

2-Methyl-3-(methyldithio)furan having the structure: ##STR46## N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR47## dimethyl sulfoxide having the structure: ##STR48## Osceola Brown Sugar produced by Osceola Farms Inc. of Pahokee, Fla. having a headspace analysis (trapped on TENAX® GC) as set forth in FIG. 27, described in the Detailed Description of the Drawings, infra:3 ml;

a 50:50 mixture of skatole and indole, with the skatole having the structure: ##STR49## and the indole having the structure: ##STR50## trimethyl amine oxide hydrate having the structure: ##STR51## acetic acid having the structure: ##STR52## and methional having the structure: ##STR53## the 24 ml (total) is diluted to 25 ml with artificial sea water.

DIET C (CONTROL DIET)

7 Ml of food grade ethyl alcohol (95%) is diluted to 25 ml with artificial sea water containing 30 ppt FRITZ® salt.

In grams, the overall growth of the Paneaus vannamei with each of the diets is set forth in the following table:

                  TABLE I                                                          ______________________________________                                         Diet        Overall Growth in Grams                                            ______________________________________                                         Diet C      1.43                                                               Diet A      1.22                                                               Diet J      1.58                                                               Diet P      1.36                                                               ______________________________________                                    

Thus, the most superior diet was Diet J, significantly better than the Control. Diet J contained the compound having the structure: ##STR54##

Another aspect of our invention is the combination of the use of the static tank apparatus and procedure with the flow-through tank apparatus and procedure.

Another aspect of our invention is the use of the combination of the static tank apparatus, the flow-through apparatus and the Y-maze apparatus and the procedures covering same.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic side elevation diagram of Penaeus vannamei, Pacific White Shrimp, farm-reared species, showing the locations of various chemoreceptors as well as other appendages that are the basis for measurement of excitation, incitation, attraction and stimulation of the Paneaus vannamei, a member of the Class Crustacea.

FIG. 2A is a schematic diagram of the static tank testing apparatus of our invention showing the interrelationship of the projection device 201 with the video camera or camcorder means 210 of our invention.

FIG. 2B is a perspective diagram of the static tank 208 shown in the static test apparatus of FIG. 2A.

FIG. 3 is a schematic cut-away side elevation view of apparatus showing the use of the flow-through testing apparatus of our invention.

FIG. 3A is a cut-away plan view of the flow-through tank apparatus of our invention taken in combination with the video camera/camcorder lens of the flow-through testing apparatus of our invention shown in FIG. 3.

FIG. 3B is a cut-away side elevation view of the flow-through tank portion of the flow-through testing apparatus of FIG. 3 of our invention.

FIG. 3C is an end view of the flow-through tank of the flow-through testing apparatus of FIG. 3 of our invention.

FIG. 4 is a cut-away side elevation view of the variable focus/focal length video camera or camcorder used in conjunction with the variable or constant intensity visible light and (i) the static tank testing apparatus of our invention; (ii) the flow-through testing apparatus of our invention or (iii) the Y-maze apparatus of our invention.

FIG. 4A is a side elevation view of the support apparatus for the camera used in conjunction with the apparatus of FIG. 4.

FIG. 4B is a front view of the support equipment for the camera of FIG. 4.

FIG. 4C is a side elevation view of another embodiment of the apparatus used in conjunction with the camera of FIG. 4.

FIG. 4D is a front view of the support apparatus for the camera of FIG. 4.

FIG. 4E is a top view of the support apparatus for the apparatus of FIG. 4.

FIG. 4F is another embodiment of the support apparatus of the equipment of FIG. 4.

FIG. 5A is the top view (cut-away) of the Y-maze testing apparatus of our invention without insertion of either a "corral" or "curved wall" insert.

FIG. 5B is a cut-away side elevation view of the apparatus of FIG. 5A.

FIG. 5C is the top view of another embodiment of the Y-maze testing apparatus of our invention containing a "corral" section at the back of the base rectangular parallelepiped section of the Y-maze.

FIG. 5D is a cut-away side elevation view of the apparatus of FIG. 5C.

FIG. 5E is a top view (cut-away) of another embodiment of the Y-maze testing apparatus of our invention containing a "curved wall" insert at the back of the base rectangular parallelepiped of the Y-maze apparatus.

FIG. 5F is a cut-away side elevation view of the Y-maze testing apparatus of FIG. 5E.

FIG. 5G is a schematic diagram illustrating the testing protocol using the Y-maze apparatus system of our invention.

FIG. 6 is a schematic diagram of Y-maze testing apparatus of the prior art.

FIG. 7 is a perspective view of the static tank testing apparatus of our invention shown in FIG. 2A.

FIG. 7A is a perspective view in schematic form of the flow-through testing apparatus of FIG. 3 (without showing the camera blind combination of our invention).

FIG. 8 sets forth two graphs showing the response "R" versus:

     --log.sub.10 C!with  --log.sub.10 C!

on the "Y" axis and the response ("R") on the "X" axis for the testing of the mixture of compounds having the structures: ##STR55## in the static tank testing apparatus.

FIG. 9 is a series of "Response as a function of concentration" graphs (parabolic and linear regression) showing on the "Y" axis:

     --log.sub.10 C!

and on the "X" axis the response "R" with "C" being in gram moles per liter for the materials:

(a) TALIN®, a mixture of Thaumatin I, Thaumatin II and Thaumatin B the liquid chromatograms of which are set forth in FIGS. 23 and 24 (TALIN® is a trademark of Tate and Lyle Limited of the United Kingdom);

(b) S-methyl methionine sulfonium chloride having the structure: ##STR56## (c) D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR57## tested against Penaeus vannamei in a static tank testing apparatus of FIGS. 2A and 7.

FIG. 10 is a series of "Response as a function of concentration" graphs (parabolic and linear regression) of:

     --log.sub.10 C!

versus response "R" with:

     --log.sub.10 C!

being on the "Y" axis and "R" being on the "X" axis for the substances:

(a) trimethyl amine oxide hydrate having the structure: ##STR58## and

(b) propiothetin (bromide) having the structure: ##STR59## in the static tank testing apparatus of FIGS. 2A and 7 as against Penaeus vannamei,

FIG. 11 is a series of "Response as a function of concentration" graphs (parabolic and linear regression) of:

     --log.sub.10 C!

versus response "R" with:

     --log.sub.10 C!

on the "Y" axis and "R" on the "X" axis for the substances:

(a) (R)(S)l-octen-3-ol having the structure: ##STR60## (a mixture of isomers having the structures: ##STR61##

(b) guanidine having the structure: ##STR62## in the static tank testing apparatus of FIGS. 2A and 7 against the species Penaeus vannamei.

FIG. 12 is a "Response as a function of concentration" graph (linear) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis for TALIN® (a mixture of Thaumatin I, Thaumatin II and Thaumatin B, the liquid chromatograms for which are set forth in FIGS. 23 and 24 described, infra) in the static tank testing apparatus for FIGS. 2A and 7 as against Penaeus vannamei. The concentration is in grams per liter.

FIG. 13 is a series of "Response as a function of concentration" graphs (parabolic and linear regression) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis for the substances:

(a) dimethyl sulfoxide having the structure: ##STR63## and

(b) methional having the structure: ##STR64## in the static tank test apparatus of FIGS. 2A and 7 as against the species Penaeus vannamei.

FIG. 14 is a "Response as a function of concentration" pair of graphs (parabolic and linear regression) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis for the substance, a 50:50 mole:mole mixture of skatole having the structure: ##STR65## and indole having the structure: ##STR66## in the static tank test apparatus of FIGS. 2A and 7 as against Penaeus vannamei.

FIG. 15 is a series of "Response as a function of concentration" graphs (parabolic and linear regression) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis for the substances:

(a) ammonium chloride;

(b) ammonia (aqueous); and

(c) acetic acid

using the static tank testing apparatus of FIGS. 2A and 7 as against the species Penaeus setiferus.

FIG. 16 is a series of "Response as a function of concentration" graphs (Linear regression) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis for the substances:

(a) glycine;

(b) betaine having the structure: ##STR67##

(c) aspartate ion (as sodium aspartate in solution)

in the static tank test apparatus of FIGS. 2A and 7 as against the species Penaeus setiferus.

FIG. 17 is a pair of "Response as a function of concentration" graphs (linear regression) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis for the substances:

(a) glucose; and

(b) taurine having the structure: ##STR68## in the static tank testing apparatus of FIGS. 2A and 7 as against Penaeus setiferus.

FIG. 18 is a schematic perspective diagram (bottom view) of the chemoreception test tank in the static tank testing apparatus of FIGS. 2A and 7.

FIG. 19 is a linear graph of flow rate (ml per minute) on the "Y" axis versus response "R" on the "X" axis for a mixture of glucose and "natural extract", a mixture of one part of equal portions of tissue of crab claw, squid mantle and shrimp abdomen in 1,000 parts of FRITZ® Super Salt Concentrate, "synthetic sea salt" solution, 30 parts per thousand, described in detail, supra. The ratio of "natural" extract:super salt solution:glucose solution being 1:1,000:1 (weight:weight:weight). The graph is for the use of the solution in the flow-through apparatus of FIGS. 3 and 3B as against the species Penaeus vannamei.

FIG. 20 is a pair of "Response as a function of concentration" graphs (linear regression) of:

     --log.sub.10 C!

(on the "Y" axis) versus response "R" on the "X" axis for various flow rates at various concentrations of ammonium acetate using the flow-through apparatus of FIGS. 3 and 3B for the species Penaeus vannamei.

FIG. 21 is a "Response as a function of concentration" graph (linear regression) of:

     --log.sub.10 C!

(on the "Y" axis) versus response "R" on the "X" axis for the substance N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR69## in the flow-through chamber testing apparatus of FIGS. 3 and 3B as against Penaeus vannamei.

FIG. 22 is a pair of "Response as a function of concentration" graphs (parabolic and linear regression) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis with C being in gram moles per liter for the substance, methional having the structure: ##STR70## using the flow-through apparatus of FIGS. 3 and 3B as against the species Penaeus vannamei.

FIG. 23 is a liquid chromatogram profile for TALIN®, trademark of Tate and Lyle Limited of the United Kingdom, a mixture of Thaumatin I, Thaumatin II and Thaumatin B.

FIG. 24 is an HPLC (high pressure liquid chromatography) profile for TALIN®, the mixture of Thaumatin B, Thaumatin I and Thaumatin II, trademark of Tate and Lyle Limited of the United Kingdom.

FIG. 25 is a pair of "Response as a function of concentration" graphs (cubic and cubic regression) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis with C being in gram moles per liter for the substance, 2-methyl-3-(methyldithio)furan having the structure: ##STR71## in the flow-through chamber testing apparatus of FIGS. 3 and 3B as against Penaeus vannamei.

FIG. 26 is a series of "Response as a function of concentration" graphs (exponential, hyperbolic and linear regression) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis with C being in gram moles per liter for the substance Osceola Brown Sugar, manufactured by Osceola Farms Inc. of Pahokee, Fla. (headspace analysis as trapped on TENAX® as set forth in FIG. 27) in the flow-through chamber testing apparatus of FIGS. 3 and 3B as against Penaeus vannamei.

FIG. 27 is a GC profile for the headspace analysis (trapped on TENAX®) for Osceola Brown Sugar, manufactured by Osceola Farms Inc. of Pahokee, Fla.

FIG. 28 is a "VENN" set diagram showing intersecting sets of stimulants, attractants, incitants and excitants for members of the species Penaeus genus of the Class Crustacea and the shaded intersection for those specific substances which are each of incitants, stimulants, excitants and attractants for members of the Penaeus genus of the Class Crustacea.

FIG. 29 is a pair of "Response as a function of concentration" graphs (hyperbolic or exponential and linear regression) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis with C being in gram moles per liter for the substance, N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR72## in the flow-through chamber testing apparatus of FIGS. 3 and 3B as against Penaeus vannamei.

FIG. 30 is a pair of "Response as a function of concentration" graphs (mean and median) (exponential and linear regression) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis with C being in gram moles per liter for the substance, methional having the structure: ##STR73##

FIG. 31 a pair of "Response as a function of concentration" graphs (mean and median) (parabolic) of:

     --log.sub.10 C!

on the "Y" axis versus response "R" on the "X" axis with C being in gram moles per liter for the substance, a 50:50 mixture of skatole having the structure: ##STR74## and indole having the structure: ##STR75## in the flow-through chamber testing apparatus of FIGS. 3 and 3B as against Penaeus vannamei.

FIG. 32 is a pair of "Response as a function of concentration" graphs (mean and median) (linear) of: on the "Y" axis versus response "R" on the "X" axis with C being in gram moles per liter for the substance methionine having the structure: ##STR76## in the flow-through chamber testing apparatus of FIGS. 3 and 3B as against Penaeus vannamei.

FIG. 33 is a graph of "Response as a function of concentration" (linear) for the mean and median of data in the static tank apparatus of FIG. 2A for yeast extract as against Penaeus vannamei.

DETAILED DESCRIPTION OF THE DRAWINGS

Referring to the cut-away schematic diagram of Penaeus vannamei species, the Penaeus vannamei is shown by reference numeral 10. Reference numerals 11a and 11b refer to the antennal flagellum. Reference numeral 12 refers to the antennular medial flagellum. Reference numeral 13 refers to the lateral antennular flagellum. Reference numeral 14 refers to the antennal scale. Reference numeral 15a refers to a dactyl of maxilliped, the maxillipedes being indicated by reference numerals 15c, 15d and 15b. Reference numeral 16 refers to the mandible, maxillule and maxilla. Reference numerals 17e, 17f, 17g, 17h and 17i refer to pereiopods. Reference numerals 17a and 17c refer to dactyls of pereiopods. Reference numerals 17b and 17d refer to the merus of pereiopods. Reference numerals 19a, 19b, 19c, 19d and 19e refer to the pleopods. Reference numerals 20a and 20b refer to uropods. Reference numeral 18 refers to the branchial chamber of the Penaeus vannamei.

In the static tank means of FIGS. 2A and 7, the following is the established grade protocol with respect to the Penaeus vannamei of FIG. 1 as shown by reference numeral 10:

                  TABLE II                                                         ______________________________________                                         Value       Description and Figure Reference Numeral                           ______________________________________                                         X           invalid run                                                        (not counted and                                                               not made part of                                                               calculation)                                                                   0           no apparent reaction                                               1           sporadic maxilliped beating (reference                                         numerals 15a, 15b and 15c); no antennular                                      activity (reference numeral 13)                                    2           regular maxilliped beating (reference numerals                                 15a, 15b and 15c); no antennular activity                                      (reference numeral 13)                                             3           regular maxilliped beating (reference numerals                                 15a, 15b and 15c); sporadic maxilliped beating                                 (reference numerals 15a, 15b and 15c)                              4           continuous maxilliped beating (reference                                       numerals 15a, 15b and 15c); sporadic                                           maxilliped beating (reference numerals 15a,                                    15b and 15c)                                                       5           continuous maxilliped beating (reference                                       numerals 15a, 15b and 15c); extreme antennular                                 activity (reference numeral 13)                                    ______________________________________                                    

With regard to the order of motion priorities, the following is the likelihood of motion priorities in investigating the Penaeus vannamei shown by reference numeral 10 on FIG. 1:

                  TABLE III                                                        ______________________________________                                         Priority    Reference Numerals                                                 ______________________________________                                         1           15 and 16                                                          2           12 and 13                                                          3           17                                                                 ______________________________________                                    

With respect to prioritized order of importance of motion, the following refers to the Penaeus vannamei shown by reference numeral 10 on FIG. 1:

                  TABLE IV                                                         ______________________________________                                         Priority    Reference Numerals                                                 ______________________________________                                         1           17                                                                 2           15                                                                 3           16                                                                 4           13                                                                 5           12                                                                 ______________________________________                                    

Referring to the apparatus of FIG. 2A, the static tank testing system, the static tank system is shown by reference numeral 200. Reference numeral 201 refers to the video monitor. Reference numeral 203 is the vessel holding testing solution 202. Testing solution 202 is pumped through line 204a using peristaltic multihead pump 206 controlled by device 205 pumping solution 202 into tank 208. Tank 208 contains liquid 212 in which Penaeus vannamei or one of the members of the Penaeus genus of the Class Crustacea is at rest on the bottom of the tank which bottom is indicated by reference numeral 214 which may be entirely composed of a clear plastic or glass so that video camera or camcorder 210 may be focused on the movement of the member of the Penaeus genus of the Class Crustacea 10 utilizing the fluorescent light generating device 211. Tank 208 is mounted on stand 209 which surrounds the video camera or camcorder 210 directed towards the tank 208. The surface of the liquid 212 is shown by reference numeral 213. FIG. 7 is a perspective view of the apparatus of FIG. 2A with each of the reference numerals of FIG. 2A repeated.

An example of the light apparatus 211 is a Flexo Heavy-Duty Adjustable Lamp made by Art Specialty Company holding two 18" fluorescent tubes. The tubes are manufactured by the General Electric Company of Schenectady, N.Y. The following specifications for the tubes used are an example of what can be used in the operation of the apparatus of FIGS. 2A and 7:

GE Catalog No. F15TS/CW;

18" Cool White fluorescent tube;

15 Watt;

Rated life of 7,500 hours;

Initial lumens=825;

Mean lumens=725;

Kelvin temperature=4,150; and

CRI rating of 62.

The peristaltic pumps utilizable are those, for example, identified as MASTERFLEX®L/S manufactured by the Cole-Parmer Instrument Company of 7425 North Oak Park Avenue, Chicago, Ill. 60648 (MASTERFLEX® being a trademark owned by Cole-Parmer Instrument Company). The pump head is a standard pump head. An example of the MASTERFLEX® tubing utilized with the MASTERFLEX® tubing pump (peristaltic pump) is C-FLEX®06424 (trademark of Cole-Parmer Instrument Company), a styrene-ethylene-butylene modified block copolymer.

Referring to FIG. 3, the flow-through vessel testing apparatus, fluid to be tested 302 is contained in container 303 and pumped through tube 304a using pump 306b and then through tube 304b into location 325 and then into vessel 350. Vessel 350 contains the member of the Penaeus genus of the Class Crustacea 10' and 10" located in the flowing liquid 312. Meanwhile, the liquid 312 is circulating by means of pump 306a through line 324a and then through 324b into tube 326a and fitting 331a where it joins with the feeding fluid (test material) at 325. The combined liquids having ever-increasing concentration of material from vessel 303 travels through holding vessel 350 into exit tube 331b past fitting 329 into tube 326b where again it is recirculated. The exit portion of the flow-through tank is 351b and the entrance portion is 351a.

The Penaeus vannamei is placed in section 351b to acclimate with only saline water 312 circulating. The experiment is started by adding liquid (302) to the liquid 312 and removing the barrier 930. The motion of Penaeus vannamei 10 from position 10" to 10' is monitored by 310 and displayed on 301.

Meanwhile, the motions of the member of the Penaeus genus of the Class Crustacea 10' and 10" is recorded using video camera or camcorder 310 shown on monitor 301. Simultaneously, light source 311 directs light into flow-through vessel 350. The side of the flow-through vessel has a clear plate through which camera 310 has a direction of vision. Screen 330 is held in place at 335. Screen 330 divides the flow-through tank between sections 351a, the entrance section and 351b, the exit section. As shown in FIGS. 3A, 3B and 3C, fluid entering the flow-through holding tank 350 enters from tube 352a and exits from tube 352b. Additional testing fluid enters through tube 304b and enters the elbow mixing with fluid from 326a at 331a. Fitting 326a is threaded into elbow 325 at 329. Fluid exits at 352b entering elbow 331b. Fitting 326b is threaded into the elbow at 329.

Referring to FIG. 4, FIG. 4 shows a side elevation view partially cut-away of apparatus showing in detail the variable focus/focal length video camera or camcorder, camera platform and shield used with the light in conjunction with the test chamber. Chamber 408 could be a flow-through chamber containing fluid 412 therein. Light source 411 emits visible wavelength radiation into the tank 408 and into the fluid 412 simultaneously with the action of video camera 410 strapped to platform 414 with bungee cord 421. Video camera 410 is mounted on a height adjuster 452 having a movable height adjustment screw 413 and imbedded ball bearings 430 at a solid surface indicated by 415. The camera is mounted so that the lens, lens shield 470 and the liquid 412 are on a direct visual line as a result of an orifice being in supporting frame 419 and another orifice indicated by reference numeral 418 being in shield 417. Supporting frame 419 and the camera lens are shielded by cloth 420 which prevents the member of the Penaeus genus of the Class Crustacea 10 from being distracted by the movement of the video camera. Thus, camera 410 may be adjusted laterally and vertically, the vertical angle adjustment coming through the use of adjustment screw 413 and the lateral travel coming through the travel using bearings 430 on the solid travel surface or lamina 415.

FIG. 4A is a detailed section of the shield 417 having attached thereto a supporting frame guide 422 at an angle preferably of 45° to the shield 417. 418 indicates the orifice mentioned in the detailed description of FIG. 4. FIG. 4B is a front view of the frame of FIG. 4A showing the orifice 418 and the supporting frame guide 422 and the vertical part of the frame 417. FIG. 4C is another side elevation view of the camera platform showing via hidden lines the adjustable camera mount platform 452 and the hinge to which the adjustable mount 452 is connected to the frame, the hinge being indicated by reference numeral 450.

FIG. 4D is the front view of the camera platform looking in the direction of the camera from the flow-through tank. The cloth cover 420 is connected via a frame 419 to a main cover 417. The orifice in the cloth 420 is indicated by reference numeral 418a, through which is placed lens shield 470 of video camera or camcorder 410.

FIG. 4E is a top view of the camera platform showing the adjustable platform 452 and the adjustable screw 413 with hinges 450 and showing the location of the inner frame 419.

FIG. 4F is a cut-away side elevation view showing, in detail, the adjustable platform 452 and the adjustable screw 413 with hinges 450 and showing the location of inner frame 419.

FIG. 5A is a top cut-away view of a Y-maze apparatus for testing chemo-attractancy of a substance. The Y-maze apparatus is indicated in general by reference numeral 500. The member of the Penaeus genus of the Class Crustacea 10 may or may not be attracted to an attractant or it may or may not be excited by an excitant. In any event, the feed line inflow fittings 560 are located at the end of the Y-maze 509a and 509b.

Thus, the test section of the Y-maze is indicated by 509a and the control section is indicated by 509b or vice versa (these two sections can be reversed by changing the chemical feed lines as shown in FIG. 5G and discussed in detail, infra). Both sections join at 540 with a joining wall 543.

The "control section" and the "testing substance input section" (also indicated by the letters "A" and "B" which can be interchanged) are at an angle "alpha" from one another, alpha being 5°-45°, preferably 10°. These sections as stated, supra, are interchangeable. The vertex of the angle is at reference numeral 540. An optional feeding station also exists in the Y-maze test section and is indicated by reference numeral 596 and in the control section at 597. Baffle plates 501a, 501b, 501c and 501d (also called "flow screens") are located close to the end 509a and 509b close to the inflow fitting 560 coming from the feed fluid peristaltic pump. The testing section is indicated overall by reference numeral 520 or 521 and the control section is indicated overall by reference numeral 520 or 521 since the two sections can be reversed by changing the chemical feed lines as shown in the detailed description of FIG. 5G, infra. The feeding section and the control section are separated by a removable screen 503 from the main section of the Y-maze 522 in which the member of the Penaeus genus of the Class crustacea 10 is located. The sides of the main section 522 are indicated by reference numerals 508a and 508b. The back end of the Y-maze 522 which is in the shape of a rectangular parallelepiped contains two drain lines 562a and 562b and a flush port 561, the back section being indicated by reference numeral 526. A baffle between the back section 526 and the main section of the Y-maze 522 is indicated by reference numeral 590. The flow of liquid travels through portal 570 underneath perforated wall 590 and around baffle 524 to the drain. The fluid level is also shown in the side view in FIG. 5B and is indicated by reference numeral 513.

FIGS. 5E and 5F show yet another embodiment of the Y-maze apparatus test tank of our invention. In this case, the baffle 590 is replaced by a curved perforated wall 590a. The embodiments of FIGS. 5C and 5D are indicated, overall, by reference numeral 510.

FIGS. 5C and 5D show yet another embodiment of the Y-maze apparatus of our invention, indicated by reference numeral 520. In this case, the perforated walls 590 and 590a are replaced by perforated walls 591a and 592a which contains perforated gate 593 which is removable. Fluid moves past the screen 593 and through weir 524 in exiting from the Y-maze.

FIG. 5G is a schematic diagram of the use of the Y-maze which is indicated by reference numeral 500 and which can be any of the Y-mazes as illustrated in FIGS. 5A, 5B, 5C, 5D, 5E or 5F.

The operation of the Y-maze is in two phases, phase I and phase II. In phase I, the "preparation" and "acclimation" phase, water is recirculated and no chemicals are tested. The test procedure is in phase II. In phase I, fluid passes through 572a and 572b through line 572 into recirculation bucket 571 and then through valve 574 which is open (valve 577 is closed for phase I). The fluid is then pumped using pump 578 through line 579 (pump 578 being also indicated as pump C). The fluid then travels through lines 579a and 579b into sections "A" and "B" of the Y-maze, through lines 660a and 660b and through openings 509a and 509b and lines 560a and 560b. During this procedure, valves 662 and 673 are closed.

In phase II, solution is pumped from either tank 666 (the liquid being indicated as 667) or liquid 668 is pumped from an alternative tank. The liquids being control or test liquids. Quick connect nipples 672a and 672b are interchangeable; and quick connect nipples 675a and 675b are also interchangeable, physically. Thus, either fluid is pumped through line 671b or is pumped through line 671a and fluid is either pumped through line 663a or line 663b. In phase II, valve 577 is open and valve 574 is closed.

New water 575 is pumped through line 576 past valve 577 using pump C, pump 578 through lines 579a and 579b. Then, pump B, pump 670 pumps liquid 668 through line 669 either into line 671b or 671a depending on which line is connected using the quick connect nipples 672a and 672b. In any event, the fluid is pumped past valve 673 through line 660b. By the same token, liquid A from tank 666, the liquid being also shown by reference numeral 667 is pumped through line 665 and then either through line 663b or line 663a depending on whether the lines are connected using quick connect nipple 675b or 675a. In any event, the fluid is pumped past valve 662 through line 660 past fitting 560a into section "A" of the Y-maze, the operation of which is described, supra. The liquid 667 is pumped using pump A, pump 664. Pumps A, B and C, that is pump 664, pump 670 and pump 578 are driven by pump drives 676.

FIG. 6 sets forth a Y-maze built particularly for starfish of the prior art (Castilia, Marine Biology, Volume 12, pages 222-228 (1972) "Responses of Asterias rubens to Bivalve Prey in a Y-maze". The apparatus indicated by reference numeral 600 is the prior art Y-maze apparatus of the Castilla article shown on page 222 thereof.

FIG. 7 is a perspective diagrammatic view of the apparatus of FIG. 2A. FIG. 7A is a perspective view in diagrammatic form of the apparatus of FIG. 3 incorporating FIGS. 3A, 3B and 3C.

With respect to each of the figures showing the video camera or camcorder described, supra, a useful video camera is a SONY® Video Camera Recorder Hi8, Model CCD-TR101 (Video Hi8 "Handycam").

FIG. 8 sets forth a graph showing the response "R" on the "Y" axis versus:

     --log.sub.10 C!

(with C being in gram moles per liter) for N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR77##

The graph indicated by reference numeral 800 is a linear regression graph drawn through each of the four points which are data points 801, 802, 803 and 804. The graph indicated by reference numeral 800a is a parabola drawn through each of the four points which are data points 801, 802, 803 and 804.

By the same token, in FIG. 9 the graph of:

     --log.sub.10 C!

versus "R" for the materials TALIN® (shown by linear regression graph 901 using data points 959, 960 and 961 and shown by the parabola 901a); S-methyl methionine sulfonium chloride having the structure: ##STR78## (using linear regression graph 902 and parabola 902a and data points 962, 963 and 966); and D-Glucosamine, an epimeric mixture of the compounds having the structures: ##STR79## (using linear regression graph 900 and data points 950 and 951).

By the same token, in FIG. 10 the graph of:

     --log.sub.10 C!

versus response "R" is for two materials, propiothetin (bromide) having the structure: ##STR80## (shown by linear regression graph 1002 and parabola 1002a and data points 1060, 1061, and 1062) and trimethyl amine oxide hydrate having the structure: ##STR81## (shown by linear regression graph 1000 and data points 1050 and 1051).

By the same token, FIG. 11 shows a graph of:

     --log.sub.10 C!

versus response "R" for use in the static test tank of FIG. 2A for the species Penaeus vannamei for the racemic mixture of 1-octen-3-ol having the structure: ##STR82## an isomeric mixture of the compounds having the structures: ##STR83## (shown by linear regression graph 1100 and parabola 1100a and data points 1150, 1152 and 1151) and for guanidine having the structure: ##STR84## (shown by linear regression graph 1101 and data points 1160 and 1161).

By the same token, FIG. 12 is a graph of:

     --log.sub.10 C!

(with C in grams per liter) versus "R" for TALIN®. The graph indicated by reference numeral 1200 is a graph for a straight line of:

     --log.sub.10 C!

versus "R" directly through data points 1250 and 1251.

By the same token, FIG. 13, the graph of:

     --log.sub.10 C!

versus "R" is for two materials:dimethyl sulfoxide having the structure: ##STR85## (indicated by the linear regression graph 1304 and the Parabola 1304a and the data points 1305, 1306 and 1307) and for methional having the structure: ##STR86## (indicated by the linear regression graph 1300 and the Parabola 1300a and data points 1301, 1302 and 1303). A mathematical model for the Parabola 1300a is:

    R=-0.0533(log.sub.10 C).sup.2 -1.23log.sub.10 C-2.25

which is of the form:

    R=α(log.sub.10 C).sup.2 +βlog.sub.10 C+γ

A mathematical model for the Parabola 1304a is:

    R=0.074(log.sub.10 C).sup.2 +1.83(log.sub.10 C)+14.47

which is of the form:

    R=α(log.sub.10 C).sup.2 +βlog.sub.10 C+γ

By the same token, the graph of FIG. 14 of:

     --log.sub.10 C!

versus "R" is for the material, a 50:50 mole:mole mixture of skatole having the structure: ##STR87## and indole having the structure: ##STR88## (with linear regression graph 1400 and parabola 1400a through data points 1401, 1402 and 1403).

The graph of FIG. 15 is also for:

     --log.sub.10 C!

versus "R" (response) for three materials for the species Penaeus setiferus tested in a static holding tank. The graph indicated by reference numeral 1500 is a regression parabolic curve involving data points 1501, 1502, 1503 and 1504 and is for aqueous ammonia. The graph indicated by reference numeral 1510 is a linear regression graph for acetic acid and its data points are indicated by reference numerals 1511, 1512 and 1513. The graph indicated by reference numeral 1500a is a parabolic curve for acetic acid directly through the data points 1511, 1512 and 1513.

The graph indicated by reference numeral 1520 is a linear regression graph for aqueous ammonium chloride and its data points are indicated by reference numerals 1521, 1522 and 1523. The graph indicated by reference numeral 1520a is a parabola directly through the data points indicated by reference numerals 1521, 1522 and 1523.

By the same token, FIG. 16 is a graph of:

     --log.sub.10 C!

versus response "R" using a static holding tank testing apparatus and involving the species Penaeus setiferus for the substances betaine having the structure: ##STR89## (indicated by the linear regression graph 1610 and the data points 5611, 1612 and 1613); glycine (indicated by the linear regression graph 1600 and the data points 1601, 1602 and 1603); and for aspartate ion (sodium aspartate in solution; indicated by linear regression graph 1620 and the data points 1621, 1622 and 1623.).

By the same token, FIG. 17 is a graph of:

     --log.sub.10 C!

versus response "R" using the static holding tank apparatus of FIG. 2 involving the species Penaeus setiferus. The graph indicated by reference numeral 1710 is for aqueous glucose and is a straight line through data points 1711 and 1712. Graph 1700 is a linear regression graph for taurine having the structure: ##STR90## using data points 1701, 1702 and 1703.

A chemoreception static test tank embodiment is set forth in the illustration in FIG. 18, in perspective. Various locations at the bottom of test tank 1800 (with the bottom indicated by reference numeral 1801.) are set forth in the test tank for reference purposes. Point "a" is indicated by reference numeral 1803. Point "b" is indicated by reference numeral 1804. Point "c" is indicated by reference numeral 1805. Point "d" is indicated by reference numeral 1806. Point "E" is indicated by reference numeral 1807. Point "F" is indicated by reference numeral 1808. Point "G" is indicated by reference numeral 1809. Point "H" is indicated by reference numeral 1810. The chemical injection point in the tank is indicated by reference numeral 1802. The member of the Penaeus genus of the Class Crustacea will move from location "b" towards any of the other locations over a given period of time with a given feed inserted at 1802. That movement is recorded and is a function of the grade "G" or "response", "R", for the particular stimulant at the particular concentration involved at injection point 1802.

Using the flow-through equipment of FIGS. 3 and 3B, a graph of flow rate (in ml per minute) versus response for the material: "glucose+natural extract+salt water" (described, supra) is indicated by linear regression graph 1900 using data points 1901, 1902 and 1903.

FIG. 20 sets forth three graphs for aqueous ammonium acetate of:

     --log.sub.10 C!

versus response "R" for three different flow rates using the flow-through apparatus of FIGS. 3 and 3B. The graph indicated by reference numeral 2000 is for a flow rate of 125 ml/minute and is a straight line through data points 2001 and 2002. The graph for a flow rate of 100 ml/minute is indicated by reference numeral 2020 and is a straight line through data points 2021 and 2022. The graph indicated by reference numeral 2010 is for a flow rate of 75 ml/minute and is a straight line through data points 2011 and 2012.

When using as test materials the ammonium chloride, ammonium acetate, aqueous ammonia and acetic acid as set forth, supra, a number of equilibria exist:

    NH.sub.4.sup.+ +H.sub.2 O⃡H+NH.sub.4 OH;

    NH.sub.4 OH⃡NH.sub.4.sup.+ +OH.sup.- ;

    H.sub.2 O⃡H.sup.+ +OH.sup.- ; ##STR91##

For the equation:

    NH.sub.4.sup.+ +H.sub.2 O⃡H.sup.+ +NH.sub.4 OH,

the relationship: ##EQU14## exists. For the equilibrium:

    NH.sub.4 OH⃡NH.sub.4.sup.+ +OH.sup.-,

the relationship:

    K.sub.i =1.8×10.sup.-5

exists.

For the equilibrium:

    H.sub.2 O⃡H.sup.+ +OH.sup.-

the relationship:

    K.sub.w =10.sup.-14

exists.

For the equilibrium: ##STR92## the relationship:

    K.sub.3 -=1.8×10.sup.-5

exists.

When ammonium acetate having the structure: ##STR93## hydrolyzes, according to the equilibrium: ##STR94## the acetic acid and aqueous ammonia further hydrolyze to form acetate ions and ammonium ions and the relationship for the hydrolysis constant:

    K.sub.hAA

for ammonium acetate is: ##EQU15##

For example, at a concentration of 10⁻⁹ for the ien:

     NH.sub.4.sup.+ !

the amount of hydrolysis to aqueous ammonia is negligible since the hydrolysis constant is 5.5×10⁻¹⁰.

At an initial concentration,

     NH.sub.4 OH!

of 10⁻¹² the amount of ionization to ammonium ion is negligible since K_(i) is 1.8×10⁻⁵.

Since all of the above equilibria are in saline solution containing chloride cations and metal anions such as sodium ion, many ion pairs exist and the standard equilibria and mathematical relationships are accordingly altered.

Referring to the graph of FIG. 21, for:

     -log.sub.10 C!

versus response for N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR95## the linear regression graph, a straight line, is indicated by reference numeral 2110 and the data points for said regression graph are indicated by reference numerals 2112, 2114 and 2116. The flow-through tank used is that set forth in FIGS. 3 and 3B described, supra, and the species tested is Penaeus vannamei.

FIG. 22, showing the relationship of:

     --log.sub.10 C!

versus response "R", shows two different graphs using three data points 2212, 2214 and 2216 for methional having the structure: ##STR96## The regression graph indicated by reference numeral 2210 is in the shape of a parabola and the mathematical model therefor is as follows:

    R=0.167(log.sub.10 C).sup.2 +3.07(log.sub.10 C)+26.092.

The linear regression graph indicated by reference numeral 2211 is for a straight line. The apparatus used is the flow-through apparatus of FIGS. 3 and 3B and the species involved is Penaeus vannamei.

Table V below sets forth mean response versus number of species of Penaeus vannamei in the group versus the particular chemical involved and its concentration. Table V is as follows:

                  TABLE V                                                          ______________________________________                                                          Number of                                                                               Average Response Using                                                Species  the Mathematical Model:                              Chemical and Concentration                                                                      in Group G.sub.2 = 100 - 10θ                            ______________________________________                                         " " (Solution of FRITZ ™                                                                     16       5.82                                                 salt in water, 35 ppt)                                                         Natural extract: 8        17.33                                                Glucose at 10.sup.-3 M                                                         N-acetyl-D-Glucosamine at                                                                       8        17.85                                                a concentration of 10.sup.-12 M                                                in 35 ppt aqueous FRITZ ™                                                   salt solution                                                                  N-acetyl-D-Glucosamine at                                                                       8        22.44                                                a concentration of 10.sup.-15 M                                                in 35 ppt aqueous FRITZ ™                                                   salt solution                                                                  N-acetyl-D-Glucosamine at                                                                       8        25.41                                                a concentration of 10.sup.-18 M                                                in 35 ppt aqueous FRITZ ™                                                   salt solution                                                                  Propiothetin (bromide) at                                                                       7        2.89                                                 10.sup.-9 M in aqueous FRITZ ™                                              salt solution at 35 ppt                                                        S-Methyl methionine                                                                             8        7.69                                                 sulfonium chloride at 10.sup.-9 M                                              (in aqueous FRITZ ™ salt                                                    solution at 35 ppt)                                                            TALIN ™ at 10.sup.-5 mg/L (of                                                                8        27.28                                                aqueous FRITZ ™ salt                                                        solution at 35 ppt)                                                            Trimethyl amine oxide                                                                           7        19.72                                                hydrate at 10.sup.-9 M (in                                                     aqueous FRITZ ™ salt                                                        solution at 35 ppt)                                                            TASTONE ™ 900 (Bakers Yeast                                                                  8        20.20                                                Extract, spray-dried                                                           manufactured by the Red                                                        Star Specialty Products                                                        Inc. of 433 East Michigan                                                      Street, Milwaukee,                                                             Wisconsin 53202) (10 mg/L                                                      of FRITZ ™ salt solution at                                                 35 ppt)                                                                        Methional at 10.sup.-9 M (in                                                                    8        18.43                                                aqueous FRITZ ™ salt                                                        solution at 5 ppt)                                                             Methional at 10.sup.-12 M (in                                                                   8        13.29                                                aqueous FRITZ ™ salt                                                        solution at 5 ppt)                                                             Methional at 10.sup.-15 M (in                                                                   7        24.94                                                aqueous FRITZ ™ salt                                                        solution at 5 ppt)                                                             Dimethyl sulfoxide at                                                                           8        43.40                                                10.sup.-12 M (in aqueous FRITZ ™                                            salt solution at 5 ppt)                                                        ______________________________________                                          Note:                                                                          The aqueous FRITZ ™ salt, described in detail, supra, is at a level in      water of 35 parts per thousand in each of the compositions set forth in        Table V.                                                                 

FIG. 23 is a liquid chromatogram profile for TALIN® (trademark of Tate and Lyle Limited of the United Kingdom), a mixture of Thaumatin I, Thaumatin II and Thaumatin B. (Conditions: S-Sepharose column operating at 7 ml per minute; gradient: 0-25 mM NaCl (2×750 ml) fraction size: 45 ml.) The peak indicated by reference numeral 2316 is for that part of TALIN® which is known as "Thaumatin I" as described in U.S. Pat. No. 5,221,624 issued on Jun. 22, 1993, the specification for which is incorporated by reference herein. The Thaumatin I can also be shown using the symbolism:

     Lys.sup.46, Asp.sup.113, Asp.sup.137 !

where "Lys" stands for "lysine" moiety; and "Asp" stands for an "Aspattic acid" moiety. The peaks indicated by reference numerals 2312 and 2314 are for "Thaumatin B" and "Thaumatin II" as described in U.S. Pat. No. 4,771,000, the specification for which is incorporated by reference herein.

FIG. 24 is the high pressure liquid chromategraphy profile for the same TALIN® as set forth concerning the description of FIG. 23.

FIG. 25 is a graph of:

     --log.sub.10 C!

versus response "R" (using the static tank test apparatus of FIGS. 2A and 7) for 2-methyl-3-(methyldithio)furan having the structure: ##STR97## The graph indicated by reference numeral 2300 and by reference numeral 2300a are "regression" graphs for a "cubic" equation. The cubic equation is of the form:

    R=α(--log.sub.10 C).sup.3 +β(--log.sub.10 C).sup.2 +γ(--log.sub.10 C)+δ

and is in fact:

    R=0.0096(log.sub.10 C).sup.3 -0.74(log.sub.10 C).sup.2 -172.6log.sub.10 C-2604.63

wherein α, β, γ and δ are constants.

FIG. 26 is a graph of:

     --log.sub.10 C!

versus response "R" using the static tank test apparatus of FIGS. 2A and 7 for "Osceola Brown Sugar", a product which is raw sugar containing impurities produced by Osceola Farms Inc. of Pahokee, Fla. The graph indicated by reference numeral 2400 is a linear regression graph, a straight line. The graph indicated by reference numeral 2400' is for a hyperbola and has the mathematical model: ##EQU16## which is of the form: ##EQU17## wherein α, β and γ are constants. The graph indicated by reference numeral 2400' is directly through the data points indicated by reference numerals 2401', 2402' and 2403'.

A duplicate set of points, 2401", 2402" and 2403" for the Osceola Brown Sugar yields an exponential equation for the exponential graph indicated by reference numeral 2400", having the mathematical model:

    R=3.4+5.33e.sup.+2.4log.sub.10 C.

FIG. 27 is a headspace analysis trapped on TENAX® and is a gas chromatograph for the headspace for the Osceola Brown Sugar produced by Osceola Farms Inc. of Pahokee, Fla.

The peak indicated by reference numeral 2705 is for carbon dioxide. The peak indicated by reference numeral 2706 is for dimethyl sulfide having the structure: ##STR98## The peak indicated by reference numeral 2707 is for acetic acid having the structure: ##STR99## The peak indicated by reference numeral 2702 is for dimethyl sulfoxide having the structure: ##STR100## The peak indicated by reference numeral 2701 is for a mixture of 2,3-dimethyl pyrazine and 2,5-dimethyl pyrazine having the structures, respectively: ##STR101## The peak indicated by reference numeral 2703 is for 2,3,5-trimethyl pyrazine having the structure: ##STR102## The peak indicated by reference numeral 2704 is for paravinyl guiacol.

FIG. 28 is a "VEIN" diagram showing the sets of incitants, stimulants, attractants and excitants for members of the Penaeus genus of the Class Crustacea. The overlapping area 2801 is that where particular substances are simultaneously incitants, stimulants, attractants and excitants for members of the Penaeus genus of the Class Crustacea. The symbol "I" is for incitants. The symbol "S" is for stimulants. The symbol "A" is for attractants. The symbol "E" is for excitants.

FIG. 29 is a graph of:

     --log.sub.10 C!

versus "response" using flow-through apparatus of FIGS. 3 and 3B for N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR103## The graph indicated by reference numeral 2900 is for the mean of data points and these mean data points are indicated by reference numerals 2901, 2902 and 2903. The mathematical model for the graph indicated by reference numeral 2900 is as a "hyperbola" to wit: ##EQU18## or an exponential equation, to wit: ##EQU19## The graph indicated by reference numeral 2910 is for a straight line for the median data points and these median data points are represented by points 2911, 2912 and 2913. The mathematical model for the graph indicated by reference numeral 2910 is:

    R=-41.98-5.68 log.sub.10 C.

FIG. 30 sets forth two graphs for the relationship of:

     --log.sub.10 C!

versus "R" for methional having the structure: ##STR104## using the flow-through apparatus of FIGS. 3 and 3B. The graph indicated by reference numeral 3000 is a straight line graph for "mean" data points 3001, 3002 and 3003 and has the mathematical model:

    R= -6.71-2.44log.sub.10 C!

The graph indicated by reference numeral 3010 is for the "median" data points 3011, 3012 and 3013 and is an exponential equation, to wit: ##EQU20##

FIG. 31 is a pair of graphs, a "median" graph and a "mean" graph for the relationship of:

     --log.sub.10 C!

versus "R" using the flow-through tank apparatus of FIGS. 3 and 3B for a 50:50 mole:mole mixture of skatole having the structure: ##STR105## and indole having the structure: ##STR106## The "median" graph is indicated by reference numeral 3110 for the "median" data points 3111, 3112 and 3113 and is a parabola having the equation:

    R=-2.34 log.sub.10 C!.sup.2 -58.77log.sub.10 C-338.

The "mean" data points are indicated by the parabola 3100 through "mean" data points 3101, 3102 and 3103. The "mean" data point parabola has the equation:

    R=-0.56 log.sub.10 C!.sup.2 -14.33log.sub.10 C-62

FIG. 32 sets forth a pair of graphs, a "mean" data point graph and a "median" J data point graph of:

     --log.sub.10 C!

versus "R" in the flow-through tank apparatus of FIGS. 3 and 3B for methionine having the structure: ##STR107## The graph indicated by reference numeral 3210 is for the median data points through points 3211 and 3212. The graph indicated by reference numeral 3200 is for the "mean" data points through data points 3201 and 3202.

FIG. 33 sets forth a pair of graphs, a "mean" data point graph and a "median" data point graph for the relationship of:

     --log.sub.10 C!

versus response "R" using static tank apparatus of FIGS. 2A and 7 for yeast extract. The graph indicated by reference numeral 3310 is for the "median" data points and goes directly through points 3311 and 3312. The graph indicated by reference numeral 3300 is for the "mean" data points and goes directly through points 3301 and 3302. 

What is claimed is:
 1. An enhanced feed composition for a member of the Penaeus genus of the Class Crustacea comprising (i) a basic feed composition and, intimately admixed therewith, (ii) an attracting and/or stimulating and/or inciting and/or exciting concentration and quantity of at least one feed enhancing substance selected from the group consisting of:(i) N-acetyl-D-Glucosamine, an epimeric mixture of compounds having the structures: ##STR108## (ii) S-methyl methionine sulfonium halides defined according to the structure: ##STR109## wherein X is a chloride or bromide anion; (iii) methionine having the structure: ##STR110## (iv) trimethyl amine oxide hydrate having the structure: ##STR111## (v) 1-octen-3-ol having the structure: ##STR112## (a mixture of isomers having the structures: ##STR113## (vi) methional having the structure: ##STR114## (vii) dimethyl sulfoxide having the structure: ##STR115## (viii) a 50:50 mole:mole mixture of skatole/indole, skatole having the structure: ##STR116## and indole having the structure: ##STR117## and (ix) 2-methyl-3-(methyldithio) furan having the structure: ##STR118##
 2. The enhanced feed composition of claim 1 wherein the enhancing substance is N-acetyl-D-Glucosamine, an epimeric mixture having the structures: ##STR119##
 3. The enhanced feed composition of claim 1 wherein the feed enhancing substance is at least one S-methyl methionine sulfonium halide having the structure: ##STR120## wherein X is a chloride anion or a bromide anion.
 4. The enhanced feed composition of claim 1 wherein the feed enhancing substance is methionine having the structure: ##STR121##
 5. The enhanced feed composition of claim 1 wherein the feed enhancing substance is trimethyl amine oxide hydrate having the structure: ##STR122##
 6. The enhanced feed composition of claim 1 wherein the feed enhancing substance is racemic 1-octen-3-ol having the structure: ##STR123## a mixture of isomers having the structures: ##STR124##
 7. The enhanced feed composition of claim 1 wherein the feed enhancing substance is methional having the structure: ##STR125##
 8. The enhanced feed composition of claim 1 wherein the enhancing feed substance is dimethyl sulfoxide having the structure: ##STR126##
 9. The enhanced feed composition of claim 1 wherein the enhancing feed substance is a 50:50 mole:mole mixture of skatole/indole, skatole having the structure: ##STR127## and indole having the structure: ##STR128##
 10. The enhanced feed composition of claim 1 wherein the feed enhancing substance is 2-methyl-3-(methyldithio)furan having the structure: ##STR129## 